Yoo Yeon Seok 유연석 (Upcoming Drama 2021 : Hospital Playlist S2) in actors & actresses Posted April 11, 2014 HAPPY BIRTHDAY YOO(AHN) YEON SEOK!A simple picture collage (of his characters in his past projects) What can I say about him? ^^ He is simply the best thing I've discovered in K-dramas last year! Since then, there’s no turning back for me and my appreciation towards this talented guy just keeps growing. No words can describe how happy I am for him to see him progressing so well in his career now! 2014 is going to be an even better year for him! Be happy and be healthy always, YYS!